What's the best way to do an IK rig for a stick figure?
If you struggled with that tutorial, you might have a hard time with Rigify too, idk (Rigify is worth learning though, imo).  But Blender has a built in Auto IK Feature; so you just add some bones, parent your mesh to the armature, then turn on the check box for "auto IK".  You need to be in Pose Mode to see the option in the tools area, where ever the heck that is now, lol.  GL OP  (tools is the screwdriver/wrench icon in the properties panel, I think)